We must take action to switch from fossil fuels

Carbon dioxide --- 392.4 parts per million. This is the current concentration in our atmosphere, and it is rising every year.

Carbon dioxide is the most important of the greenhouse gases that retain the earth's heat. It is in large supply and lasts hundreds of years.

This is the highest it has been in 800,000 years.

The other greenhouse gases such as methane, ozone and water vapor also play an important part. The water is not a primary cause as it is secondary to the heating or cooling.

The National Academy of Science, in a report requested by Congress, concludes that the science is credible, climate change is occurring and it is largely caused by human activities. This is the same opinion of the other credible scientific groups in the developed world and 97 percent of climatologists.

Fortunately, because humans are the cause, we also can be the solution by conservation of energy and switching from fossil fuels to renewable ones. This also is a moral issue as the developed nations cause it and the poor will do the most suffering.